"clone block" should insert empty line

[pokey]

I believe we'll get this one roughly for free from #210

[AndreasArvidsson]

Well clone is defined as copyLinesDown. It has really no concept of selection/scope type.

[pokey]

Sure. But it seems like nice behaviour no? Tbh I'm tempted to generalise it and just call it cloneDown. Could see using it to clone args and whatnot. Then you'd expect it to inset a delimiter

[AndreasArvidsson]

Yes it would be useful, but if won't use them for arguments and similar I should probably be copyAfter or cloneAfter

[pokey]

Fixed by #672